no codesigning certificates found

From the "Known issues" of https://developer.apple.com/support/certificates/expiration/:

"in the Keychain Access application, select the System keychain. Select 'Show Expired Certificates' in the View menu and then delete the expired version of the Apple Worldwide Developer Relations Certificate Authority Intermediate certificate."

and then install the new Apple Worldwide Developer Relations Certificate from apple from here

https://developer.apple.com/support/certificates/expiration/
Even if you have installed the new certificate, you have to delete the expired one from the System keychain.